Field length validator ltr 2

[landonreed]

Refactor #276 a bit.

[evansiroky]

Has merge conflicts.

[codecov-io]

Codecov Report

Merging #277 into field-length-validator will increase coverage by 0.02%.
The diff coverage is 100%.

@@                     Coverage Diff                      @@
##             field-length-validator     #277      +/-   ##
============================================================
+ Coverage                     65.28%   65.31%   +0.02%     
+ Complexity                      880      879       -1     
============================================================
  Files                           135      135              
  Lines                          6750     6743       -7     
  Branches                        795      795              
============================================================
- Hits                           4407     4404       -3     
+ Misses                         2044     2039       -5     
- Partials                        299      300       +1

Impacted Files	Coverage Δ	Complexity Δ
...conveyal/gtfs/validator/ReversedTripValidator.java	8.77% <ø> (+0.43%)	3 <0> (ø)	⬇️
src/main/java/com/conveyal/gtfs/loader/Feed.java	75.86% <100%> (+0.05%)	8 <0> (ø)	⬇️
src/main/java/com/conveyal/gtfs/GTFS.java	55.55% <100%> (ø)	12 <0> (-1)	⬇️
src/main/java/com/conveyal/gtfs/PatternFinder.java	85.22% <0%> (ø)	20% <0%> (ø)	⬇️

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[landonreed]

🎉 This PR is included in version 6.0.0 🎉

The release is available on GitHub release

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